Listeria spp., Fostering a shift in food safety culture

Transcription

1 Listeria spp., Fostering a shift in food safety culture

2 Welcome! Shawn Gartside Regional Sales Manager Trevor Morones Lead Food Safety Consultant 2

3 Topics Characteristics History Presence Environmental monitoring Food safety culture Sampling procedures/collection Available technologies. Testing In-house vs. 3 rd party Methods Costs, features, and benefits 3

4 What area of the food and beverage business do you represent? Retail? Animal/Pet Supplier Manufacturer? Domestic Manufacturer? Distribution? Produce Grower/Packer/Processor?

5 Listeria 1924 isolated Grampositive rods 1940 named genus Listeria for catalasepositive, Grampositive rods 1949 Epidemic of listeriosis in newborns in Germany

6 Lm Listeria monocytogenes Gram-positive Catalase-positive Non-sporeforming Slim rod Colonies are smooth, convex, circular, bluish translucent appearance on nonselective agars; atypical rough colonies form filaments 6

7 Outbreak rachelcooks.com First Outbreak Canada 1981, Coleslaw 1600 illnesses and 260 deaths due to listeriosis occur annually in the United States Serious threat to high-risk populations 7

8 Presence of Listeria Entry Soil (shoes, vehicles, clothing) Contaminated raw plant and animal tissue Human carriers Popular locations Floor drains Condensed water Floors Processing equipment Surfaces

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10 What is the biggest challenge you face with food safety culture? Management support? Upper management support? Tools to deliver the message? How to Start?

11 Food Safety Culture Knowledge is power A strong culture becomes contagious Trends are contagious Every team member has a responsibility to ensure safe unadulterated food enters commerce

12 From the start Culture should be instilled from day one - Onboarding - Uniform - Physical environment Break areas Locker rooms Restrooms - Management style

13 News: FSIS Pilot - Notice /20/16 pilot project to assess whether retailers are using the recommendations in the FSIS Best Practices Guidance for Controlling Listeria monocytogenes (Lm) in Retail Delicatessens (FSIS Retail Lm Guideline)

14 Fostering a shift in food safety culture Abbott, Cheese British Columbia (2002) Whittier Farms, Pasteurized Milk Massachusetts (2007) Sangar, Fresh Cut Produce Texas (2010) Jensen Farms, Cantaloupe Nationwide (2011) Marte, ricotta salata cheese Multistate (2012)

15 Environmental Monitoring interested in finding any type of Listeria (generic Listeria species). Non-food contact surfaces and food contacts surfaces Best practice to hold lots until results are received but not always feasible

16 Key words and concepts Ø Listeria sp. vs Listeria monocytogenes- Listeria species- contain several types of Listeria, not regulated. Most companies use as indicator for environmental testing. Listeria monocytogenes- Specific Listeria species that is pathogenic with a zero tolerance regulation in food. Ø Environmental testing vs. Product testing- Proactive (HACCP) vs. Reactive Ø Presumptive Positive- Any positive result by a rapid method that is not USDA or FDA culture Ø Confirmation- USDA or FDA culture, or secondary verification by another technology. Listeria sp. tests are sometimes confirmed for Listeria mono. Ø Enrichment Media- Liquid or solid nutrients for the growth of bacteria-sometime specific for the type of bacteria UVM, BLEB, Frasier broth, MOX Ø False positive and False negative- measurement of the accuracy of a test. Determined by confirmation of original sample Proprietary & Confidential - Do Not Distribute

17 Listeria testing methods-characteristics PCR Immunoassay Sample6 Technology base DNA or RNA Cell Surface- Antibodies and Antigens Phage based with Bioluminescent detection Time to result hour growth 1-4 hours detection hours TTR hours growth 10 minutes-2 hour detection hours TTR 6 hour resuscitation 5 minute detection 7 hour TTR Detection limit 1 CFU pre-enrichment 10,000 CFU/mL post 1 CFU pre-enrichment 100,000+ CFU/mL post 1 CFU pre-incubation Software Included Some times Included Included

18 Are you currently testing for Listeria? In-House? 3 rd Party Lab? Both No?

19 3 rd party vs. in house testing 3 rd party lab In house lab Location Off site away from plant At or near plant- consider method carefully Time to result 2-5 days 7-48 hours Cost $20-$55 / test plus overnight shipping or courier $8-$30 / test Regulatory Certified and Use AOAC methods Some AOAC methods not USDA approved Document training and GLP Some methods not USDA approved

20 Listeria testing methods- Capital equipment PCR Immunoassay Sample6 Equipment Cost $15,000-$55,000 (includes thermocycler, computer workstation, monitor) $35,000 (liquid handler, computer, hand-held scanner) $10,000 (includes luminometer, centrifuge, pipette, ipad, other supplies) Additional Equipment Needed Heat Blocks with insert: $1,800-2,000 Incubator Heat Block: $800 Incubator Standard Incubator Maintenance Contract Included in Contract $5,000-$7,000 / year Not Needed

21 Comparing costs-test and consumables PCR Immunoassay Sample6 Kit Cost $650-$950 (96 tests) $300 -$600 (60 tests) $1,600 (100 tests) Enrichment Media Costs $60 - $80 (96 tests) $80 - $100 (60 tests) Included Lab Supply Costs $100 - $200 (96 tests) $100 - $200 (60 tests) Included Total Cost per Test $9 - $11 $8 - $15 per test $16 per test

22 Comparing costs-labor considerations PCR Immunoassay Sample6 Operator Skill Bachelor or Masters + Experience Bachelor or Masters + Experience No Technical Degree Required Sample Prep Time 2-3 minutes / sample 2-3 minutes / sample 2-3 minutes / sample Hands-on Analyst Time minutes minutes for one run 15 minutes Incubation Time 48 hours hours total 6 hours Assay Time 3.5 hours 90 minutes 20 seconds/sample

23 Transform Pathogen Food Testing Integrated, End-to-end Solution for Environmental Food Testing Sample6 DETECT Assay Kit & Consumables Sample6 CONTROL Proprietary Monitoring Software

24 AOAC Certification & USDA Authorized AOAC The Association of Official and Analytical Chemists (AOAC) is an independent nonprofit organization that was formerly tied to the FDA, whose responsibilities are to: ü Establish standards ü Conduct conformity assessment The food industry de facto requires that any new assay be AOAC-certified before food processors evaluate and commit to deployment Sample6 Certification AOAC-RI PTM (Performance Tested Method) Method Published in the Journal of AOAC International

25 How do you currently manage your testing results? Excel spreadsheet? Lab Notebook? Other software? I don t know?

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27 The Science of Speed 0 hours 6 hours Engineered phage interacts specifically with target bacterial cells Bacteria over-produce the reporter enzyme Cells lyse and the reporter is detected 1 CELL 10K ENZYMES 100M PHOTONS

28 delivers actionable results in-shift DETECT DETECT In-shift, In-plant PCR 4-8 shifts Immunoassay 5-9 shifts Culture 12 shifts

29 DETECT & CONTROL

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31 BETTER TOOLS PROVIDE A CLEAR PATH TO SAFETY Revolutionizing food safety by delivering immediately actionable pathogen detection and software to the plant to minimize risks

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